Tor Browser

Tor Browser lets you use Tor on Microsoft Windows, Apple MacOS, or GNU/Linux without needing to install any software. It can run off a USB flash drive, comes with a pre-configured web browser to protect your anonymity, and is self-contained (portable).

Downsides:

Downsides? Using Tor will be slower than with other browsers and it can be demanding to use to its full privacy potential. Some people think that anyone who uses Tor is trying to hide something. Of course they are right. If privacy is that important, let them think what they want.